Inner tube for tires



H. L. PIXLEY.

INNER TUBEFOR TIRES. 'A'PPLVICATION FILEDIJULY 11. 1-919.

- within the cross sectional dimension of the 'the terms of the appended claims.

HENRY L. PIXLE'Y, OF-CLEVELAND, OHIO.

INNER TUBE FOR TIRES.

Application filed July 11, 1919. Serial No. 310,161.

T 0 a]? whom it may con-0cm:

l, the tube 1 is reenforced by a suitable num- Be it known that l, HENRY L. PIXLEY, a

ber of layers 2 of fabric or the like throughcitizen of the United States, residing at out the greater portion of its transverse cir- Cleveland. in the county of Cuyahoga and cumference. the reenforcing layers being ar- State of Ohio, have invented a certain new ranged so that there is a greater thickness and useful Improvement in llnner Tubes for of reenforcement and rubber within the zone Tires, of which the following is a full, clear, which is disposed adjacent the tread of the and exact description, reference being had to shoe or casing 3 when the parts are assemthe accompanying drawings. bled for use, than elsewhere. The inner por- This invention relates to an improved intiOn of the tube, that designated 1 is free ner tube for pneumatic tires such as are used from any reenforceme nt, wherefore it is elas on automobiles, motorcycles, and the like, tic, and the tube is formed so that such porand has for its objects the production of a tion tends to contract within the cross-secvery durable tube which is practically imtlonal dimension of the tire, as illustrated in mune from puncture by penetration and Figs 1 and 2. capable of withstanding avery high internal When the tube is placed within a casing pressure thus minimizing the liability of and the latter is sprung upon a rim, the blow outs; and which is so constructed doing of which is illustrated in Fig. 2, and that, when deflated its inner side-or that the tube thereafterinflated, the tube assumes which reposes adjacent the rim when the the shape and position indicated in Fig. 3, tire is m0unted-aut0matically contracts the portion 1 expanding to fill in the space within the cross-sectional dimension of the between the beads 3 of the casing and entire so as to insure against the tubes being gage against thesurface of the rim 4 therepinched and thereby injured when applying between, the transverse circumference of the the casing 01' shoe containing the tube to a tube increasing to that of the internal diamrim by the tire irons usually employed for eter of the shoe or casing. such pur o j W 1th the portion of the tube which re- To these ends I thicken and reenforce the poses within the exposed part of the shoe or wall of the tube throughout the greater porcasing-the part beyond the flanges of the tion of its transverse circumference, leaving rim-reenforced as described, it is obvious a part of th wall, pr ferably that whi h rethat the same would be difficult of puncture. poses next to the rim when the tire is in use, for besides the reenforcement of the tube free from the reenforcing means or fabric, so resisting the sharp point or edge of an obthat such part is at liberty to stretch, allowject projected through the wall of the shoe ing the tube to expand under pressure and e or casing from penetrating the wall of the thoroughly fill the casing or shoe; and the. tube, the tube would yield because of the tube is molded or formed in such a way that greater flexibility as compared to that of. the when deflated the inner side tends to retract casing sufliciently to follow the point or edge of the object inward, thus offering little resistance to the inward movement of the obj ect and saving the tube from puncture. ing reenforced as is throughout the area tube so as to actually increase the inner diameter of the annular tube.

In the accompanying drawing I have illustrated an embodiment of my invention and while I shall proceed to describe the present construction in detail, it will be unto blow-out than the usual type. of tubes derstood that do not limit myself to these that contaln no reenforcement. structural details further than required by By reason of the natural tendency of the portion 1 of the tube to retract within the In the drawing, Fig. 1 isa transverse seccross-sectional dimension of the tube, such tion through my improved tube; Fig. 2shows portion is entirely out of the way of the tire the tube inside a casing that is being placed iron 5 as it is manipulated in the application upon a rim by means of a tire iron; and Fig. of the shoe or casing 3- to the rim 4. This 3 shows the parts of Fig. 2 properly assemfeature of the invention, therefore, obviates bled and the tire in inflated condition. a ver cominon difliculty, to Wit: that of Referring now to the cross-section of Fig. pinching the tube between the inner end of the tire iron and rim when applying the casing, such usually resulting in serious injury to the tube as the cutting of it.

Preferably the entire inner and outer surfaces of the tube are coated with a layer of so-called new rubber, as indicated by the heavy black outlines of Fig. 1, the coating being designated 1 in said figure; and the external coating, engaging the inner wall of the shoe or casing, prevents the tube from creeping within the shoe because of the natural tendency of new rubber to cling to a surface and resist slipping.

having thus described my invention. what I claim is:

1. As a new article of manufacture. a removable inner tube t'or tires having a reentrant portion extending about its inner side, the outer side portion of the tube being relatively stifi and tending normally to contract the reentrant portion and impart to it a material depth thereby to provide clearance for a tire iron.

2. As a new article of manufacture, movable inner tube for tires having a reentrant portion extending about its inner side. the outer side portion being of greater thickness than the inner side and having layers of reent'orcing material embedded and consolidated therewithin. whereby the outer side portion is rendered relatively still", sueh portion being so shaped as to tend normally to contract the reentrant portion and impart to it a material depth.

In testimony whereof, I hereunto aflix my signature.

I re- HENRY L, PIXLEY. 

